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Finding the Fourth Proportional to 391, 586.60 and 134.50

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Solution

The fourth proportional to 391, 586.60 and 134.50 is: 201.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    391 : 586.60 = 134.50 : x
  2. Step 2: Convert to fraction form
    391/586.60 = 134.50/x
  3. Step 3: Cross multiply
    391x = 586.60 × 134.50
  4. Step 4: Simplify right side
    391x = 78,897.70
  5. Step 5: Solve for x
    x = 78,897.70/391
  6. Step 6: Final answer
    x = 201.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.